ungqr_batch_scratchpad_size (Group Version)

oneMKL - Data Parallel C++ Developer Reference

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ID 772045

Date 7/13/2023

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ungqr_batch_scratchpad_size (Group Version)

Computes size of scratchpad memory required for ungqr_batch (Group Version) function. This routine belongs to the oneapi::mkl::lapack namespace.

Description
API

Description

Computes the number of elements of type T the scratchpad memory to be passed to the ungqr_batch (Group Version) function must be able to hold.

API

Syntax

namespace oneapi::mkl::lapack {
  std::int64_t ungqr_batch_scratchpad_size(sycl::queue &queue,
  std::int64_t *m,
  std::int64_t *n,
  std::int64_t *k,
  std::int64_t *lda,
  std::int64_t group_count,
  std::int64_t *group_sizes)
}

This function supports the following precisions and devices:

T	Devices supported
`std::complex<float>`	CPU and GPU
`std::complex<double>`	CPU and GPU

Input Parameters

queue

Device queue where calculations will be performed.

m

Array of group_count parameters m_g as previously supplied to geqrf_batch (Group Version) (m_g ≥ 0).

n

Array of group_count parameters n_g as previously supplied to geqrf_batch (Group Version) (n_g ≥ 0).

k

Array of group_count parameters k_g.

The number of elementary reflectors whose product defines the matrices Q_i (0 ≤ k_g≤ n_g).

lda

The leading dimension of A_i as previously supplied to geqrf_batch (Group Version) (lda_g≥ max(1, m_g)).

group_count

Specifies the number of groups of parameters. Must be at least 0.

group_sizes

Array of group_count integers. Array element with index g specifies the number of problems to solve for each of the groups of parameters g. So the total number of problems to solve, batch_size, is a sum of all parameter group sizes.

Exceptions

Exception	Description
`mkl::lapack::exception`	This exception is thrown when an incorrect argument value is supplied. You can determine the position of the incorrect argument by the info() method of the exception object.

Return Values

The number of elements of type T the scratchpad memory to be passed to the ungqr_batch (Group Version) function must be able to hold.

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ungqr_batch_scratchpad_size (Group Version)

Description

API